JP2011203310A - Front plate for image display apparatus, and image display apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front plate for an image display apparatus having a colored layer in the peripheral edge, along with an image display apparatus using the same, capable of preventing the generation of bubbles at the inner end of the colored layer not to impair the appearance.SOLUTION: The front plate 10 for the image display apparatus includes the colored layer 2, that is provided on the peripheral edge of transparent base material 1 and gradually increased in thickness as it goes from the inside toward the outside. The image display apparatus 20 includes: the front plate for the image display apparatus; a transparent adhesive layer 3 closely adhering to be stacked on the surface where the colored layer is formed; and an image display plate 4 at least in order. Further, a micro-louver filter including a linear dark color line part where a number of dark color line parts are arranged parallel to each other in the extending direction and a transparent resin layer between the dark color line parts may be included between the transparent adhesive layer and the image display plate.

Description

  The present invention relates to a front plate for an image display device which is used by being arranged on the front surface of an image display plate when an image display device such as a liquid crystal panel is used as an image display device.

Currently, various image display boards (display panels) such as a liquid crystal panel, a plasma display panel (PDP), and an electroluminescence (EL) panel have become widespread. Various image display devices such as a digital photo frame (digital photo frame) as well as a so-called television (John receiver) are made using these various image display boards. In this case, a front plate for an image display device may be arranged in front of the image display plate. Such a front plate for an image display device is made of a transparent plate, and a black frame is formed around the periphery of the region not used for image display. In many cases, a colored layer colored like a frame is provided (Patent Document 1).
An image display device front plate 101 and an image display device 201 shown in the cross-sectional view of FIG. 8 are examples thereof, and the image display device 201 sequentially includes an image display device front plate 101 and a transparent adhesive. An agent layer 3, a filter 7, a transparent adhesive layer 3, and an image display board 4 are included. The front plate 101 for an image display device has a colored layer 21 at the peripheral edge of the transparent substrate 1 on the image display plate 4 side.

JP 2002-9484 A

  However, when such a front plate for an image display device is disposed on the front surface of the image display plate (display panel), if an adhesive layer is closely stacked without leaving a space in between so as not to reduce the light transmittance, Because there is a step corresponding to the thickness of the colored layer at the inner edge of the colored layer provided on the peripheral edge of the front plate, bubbles are generated there, the light is scattered and looks white, and the appearance of the image display device is impaired. There's a problem.

For example, as shown in FIG. 9, in the conventional front plate 101 for an image display device, the colored portion 21 is printed at a constant thickness on the peripheral edge of the transparent base material 1 The image display device front plate 101 is adhered and laminated on the image image display plate 4 such as a liquid crystal panel with the transparent adhesive layer 3 with the colored portion 21 side facing the image display plate 4 side. It has become. And it is anchored in the level | step difference part of the inner boundary of the coloring part 21, and the bubble G arises. Usually, the colored portion 21 is formed by printing with black ink or the like with a thick film of about 2 to 10 μm in thickness in the entire colored portion, for example, in order to provide concealment. For this reason, the bubbles G are adhered to the image display device front plate 101 and the adhesive when the image display device front plate 101 is adhered and laminated to the image display plate 4 using an adhesive or an adhesive for the transparent adhesive layer 3. A part of the air between the layers 3 remains in the step portion of the colored portion without being completely removed.
The generation of the bubbles G is particularly possible when at least one of them is flexible like a resin film, but it can be laminated while squeezing air with a roller, but bubbles may still be generated, and both are particularly rigid. It tends to occur when it is plate-shaped.

  That is, an object of the present invention is to prevent generation of bubbles at the inner end portion of the colored portion and to maintain the appearance of the front plate for an image display device having a colored layer on the peripheral portion and an image display device using the same. Is to do.

Therefore, the present invention has the following configuration.
(1) A front plate for an image display device having a colored layer at a peripheral edge on a substrate surface of a transparent substrate,
The front plate for an image display device, wherein the thickness of the colored layer increases from the inside to the outside of the front plate.
(2) An image including at least the image display device in this order, the image display device front plate, a transparent adhesive layer adhered and laminated on the surface of the image display device front plate on which the colored layer is formed, and Display device.
(3) In the image display device according to (2), a linear dark line portion in which a plurality of extending directions are arranged parallel to each other between the transparent adhesive layer and the image display plate, and the dark line portion An image display device comprising a micro louver type filter comprising a transparent resin layer therebetween.

(A) According to the image display device front plate and the image display device of the present invention, the thickness of the colored portion increases from the inside to the outside of the image display device front plate. Since it can be made smaller even if it exists, air can be surely escaped between the transparent adhesive layer and the surface on which the colored layer of the front plate for the image display device is formed, when the transparent adhesive layer is adhered and laminated. it can. As a result, the generation of bubbles can be prevented, and light is scattered by the bubbles and looks white and the appearance is not impaired.
(B) Further, according to the image display device including the micro louver type filter, it is possible to control the traveling direction of the image light from the image display board and the ambient light in the surrounding environment by the filter. As a result, it is possible to improve the bright room contrast by reducing the influence of outside light, and to appropriately collect or diffuse the image light from the image display board to improve the front luminance or optimize the viewing angle. Can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining each 1 form about the front board for image display apparatuses by this invention, and an image display apparatus using the same, (a1) is sectional drawing of an image display apparatus front board, a2) is for image display apparatuses. A plan view of the front plate, (b) is a cross-sectional view of the image display device. Sectional drawing which illustrates another 1 form (with a micro louver type filter) of the image display apparatus by this invention. Sectional drawing which illustrates another form (a colored layer is step shape) of the front plate for image display apparatuses by this invention. The top view which illustrates another form (with a predetermined pattern in a colored layer) of the front plate for image display apparatuses by this invention. Sectional drawing which illustrates another form (there is a non-formation part in a colored layer) of the front plate for image display apparatuses by this invention. Sectional drawing which illustrates the various examples of the main cut surface shape of the dark color strip part of a micro louver type | mold filter. Sectional drawing which illustrates another 1 form (with another filter) of the image display apparatus by this invention. Sectional drawing which illustrates an example of the conventional front plate for image display apparatuses, and an image display apparatus. Sectional drawing explaining the bubble which generate | occur | produces in the level | step difference of the inner side edge part of a coloring part with the front plate for conventional image display apparatuses, and an image display apparatus.

    The present invention will be described below with reference to the drawings. Note that the drawings are conceptual diagrams, and the scale relationships, aspect ratios, and the like of components may be exaggerated.

<< First Embodiment >>
A first embodiment of an image display device front plate 10 and an image display device 20 according to the present invention will be described with reference to FIG. The cross-sectional view of FIG. 1A1 and the plan view of FIG. 1A2 are one form of the front panel 10 for an image display device according to the present invention, and the cross-sectional view of FIG. It is one form of the image display apparatus 20 by this invention using the front plate 10 for display apparatuses. 1A1 is a cross-sectional view taken along line AA in the plan view of FIG. 1A2. Further, the observer V side is the upper side of the drawing.

[Front panel for image display device]
The front plate 10 for an image display device has a black colored layer around the entire periphery of the substrate surface on the back side (image display plate 4 side) of a rigid acrylic resin plate having a thickness of 5 mm as the transparent substrate 1. 2 is printed and formed so that the thickness continuously increases from the inner side to the outer side of the front plate 10 for the image display device. Accordingly, there is no level difference at the inner end portion of the colored portion 2 where bubbles are generated. Further, the front plate 10 for the image display device is a transparent portion whose entire surface is transparent inside the colored layer 2 at the peripheral portion so that the image of the combined image display plate can be seen through. Hereinafter, each component will be described in detail.

[Transparent substrate]
The transparent substrate 1 protects the image display board 10 from the front surface when incorporated in the image display device 20, and the colored portion 2 formed on the peripheral edge thereof is arbitrarily attached to the image display device 20 as a black frame or the like. It is also a member that produces the design. Therefore, although an acrylic resin plate is selected in the present embodiment, various materials and thicknesses can be generally used. That is, the transparent substrate 1 is preferably transparent and has a suitable mechanical strength. If it is made of such a material, there is no particular limitation, and a material suitable for the application can be used.
Therefore, as the material of the transparent substrate 1, in addition to organic materials such as resin, inorganic materials such as glass and ceramics are used, and the form is preferably a rigid plate in terms of mechanical strength, There may be a flexible sheet or film. In the case of a plate, a glass plate or a resin plate is typical. There may also be a laminate such as a laminate of a resin material and an inorganic material. Examples of the resin of the resin plate or resin sheet (or film) include acrylic resins, styrene resins, acrylonitrile / styrene resins (AS resins), polycarbonate resins, polyester resins, polyolefin resins, and the like. is there.
The thickness of the transparent substrate 1 in the form of a plate, sheet or film is usually about 20 μm to 10 mm, for example. The term “plate” generally means an object that is rigid with respect to the sheet or film, but the degree of rigidity differs depending on the material even with the same thickness, and there is a flexible object even with a rubber material (not applicable to a transparent substrate) of 10 mm. Therefore, although it cannot be strictly distinguished by thickness, an object of about 1 mm or more can be regarded as a plate.

[Colored layer]
The colored layer 2 is a layer colored in a color corresponding to the application or design, such as black, brown, white, amber, red, gold, or silver. For example, when it is incorporated into the image display device 10 for use in a digital photo frame, the frame is designed as an outer frame of a digital image displayed on the image display board 4.
Further, normally, the colored layer 2 cannot be seen when the image display device 20 is viewed from the front, such as terminals, backlights, and other components installed in the periphery of the image display area at the center of the image display board 4. Therefore, it is formed as a concealing layer.
The colored layer 2 according to the present invention does not have a constant thickness from the inside to the outside of the central transparent portion of the front plate 10 for the image display device, and increases in thickness from the inside to the outside.
Such a colored portion 2 can be formed by a printing method such as silk screen printing, gravure printing, or transfer printing. The change in thickness can be imparted by adjusting printing conditions such as halftone dot percentage in halftone printing, plate cell depth, cell area density, and ink fluidity in gravure printing. In addition, the thickness of the colored layer 2 is 2 to 10 μm on average from the inside to the outside in consideration of concealability and the like. Moreover, since it is necessary to make the thickness of the boundary part inside the colored layer 2 into a level | step difference which does not produce the bubble G, it is preferable to set it as less than 1 micrometer, More preferably, it is less than 0.5 micrometer.

(Image display device)
The image display device 20 shown in FIG. 1B is a device having a configuration in which the image display device front plate 10 is adhered and laminated on the front surface of the image display plate 4 with the transparent adhesive layer 3. The front and back directions of the front plate 10 for the image display device are transparent to the image display plate 4 on the surface of the transparent substrate 1 on the side where the colored portion 2 is formed, with the colored portion 2 side on the back side being the image display plate 4 side. The adhesive layer 3 is adhered and laminated. The image display plate 4 is a liquid crystal panel, and includes a polarizing plate that is closely stacked on the front glass. The surface of the polarizing plate is the adhesive surface of the transparent adhesive layer 3. The transparent adhesive layer 3 is an acrylic resin-based pressure-sensitive adhesive, and is formed using a double-sided pressure-sensitive adhesive sheet whose both surfaces are protected by a separator film.

  In addition, the adhesion lamination of the transparent adhesive layer 3 by the double-sided pressure-sensitive adhesive sheet is performed after placing the pressure-sensitive adhesive sheet from which the separator films on both the front and back sides are peeled on the image display plate 4 and the front plate 10 for the image display device. After deaeration and heat-bonding under vacuum, the pressure is returned to normal pressure, and then autoclaved to complete the bonding.

  In the image display device front plate 10 used in the image display device 20, the thickness of the colored portion 2 increases from the inside toward the outside. There is no thickness difference such that bubbles are generated, and the air between the front panel 10 for the image display device and the adhesive layer 3 smoothly escapes to the outside. For this reason, bubbles are not generated and the appearance is not impaired.

[Transparent adhesive layer]
As the material for the transparent adhesive layer 3, an acrylic resin-based pressure-sensitive adhesive is selected in the present embodiment, but various materials and adhesive forms can be used in general. If it is transparent, there is no particular limitation, and a thermoplastic resin, or a curable resin such as a thermosetting resin or an ionizing radiation curable resin can be used. For the transparent adhesive layer 3, one or two or more mixed resins of these resins are used. For example, as the thermoplastic resin, an acrylic resin, a polyvinyl butyral resin, an ethylene-vinyl acetate copolymer, or the like can be used.
The transparent adhesive layer 3 can further contain a plasticizer, a tackifier, a stabilizer, and the like. The transparent adhesive layer 3 also includes a pressure-sensitive adhesive layer. As the resin for the pressure-sensitive adhesive layer, known pressure-sensitive adhesives such as acrylic resin-based, polyester-based resin, rubber-based, silicone-based, or ethylene-vinyl acetate copolymer (EVA) -based can be used.
When the transparent adhesive layer 3 is applied as an adhesive sheet (including a pressure-sensitive adhesive sheet), the adhesive sheet may be formed of these resins in total thickness, but both surfaces of a transparent resin film (including sheet) are used. Moreover, what formed the layer of these resin can be used.

In addition, adhesion by the transparent adhesive layer 3 is performed by heat fusion (heat sensitive type), thermosetting (thermosetting type), ionizing radiation irradiation (ionizing radiation curable type), pressure (pressure sensitive type), or a combination thereof. Do.
The transparent adhesive layer 3 is in the form of an adhesive sheet, placed between the image display device front plate 10 and the image display plate 4 of the adherend, and then heated, pressurized, etc. In addition to the close lamination, the adhesive is applied to the adhesive surface of the front plate 10 for the image display device, the adhesive surface of the image display plate 4 of the adherend, or both of these adhesive surfaces, and then the image display device. The front plate 10 for use and the adherend can also be laminated.
Further, the thickness of the transparent adhesive layer 3 may be at least the maximum thickness of the colored layer 2 so that the entire thickness of the colored layer 2 can be absorbed. Therefore, if the maximum thickness of the colored layer 2 is 2 to 10 μm, any thickness of the colored layer 2 within the thickness range can be absorbed if the thickness exceeds 10 μm. On the other hand, the thickness of the transparent adhesive layer 3 is about 100 μm at the maximum.

"Definition of terms"
Here, definitions of terms used in this specification will be described.
The “observer side” is a direction (side) in which the image display device front plate 10 and the image display device 20 are viewed from the observer. Further, in the front plate 10 for an image display device, or the member or layer disposed on the viewer side of the image display plate 4, the side opposite to the viewer side is referred to as “image display plate”. Also called “side”. The observer side is also referred to as “front side” and the opposite side is also referred to as “back side”.
The “main cut surface” is a surface that is orthogonal to the direction (extension direction) in which the linear dark colored stripes 5 a extend in the microlouver filter 5, and is a front plate for an image display device. 10 means a surface including a normal line perpendicular to the plate surface, and “main cut surface shape” means a shape in the “main cut surface”.
The “surface direction” is a direction of a surface parallel to the substrate surface of the transparent substrate 1, and the “vertical direction” is a direction of a normal line perpendicular to the “substrate surface”.
The “vertical direction” means a direction parallel to the gravitational direction when the image display apparatus 20 is assumed to be installed, and the direction orthogonal to the vertical direction is the “horizontal direction”. When the observer looks at the image display device 20 in this installed state, the upper side in the vertical direction is “top”, the ground side is “ground”, the left side in the horizontal direction is “left”, and the right side is “right”.

<< Second Embodiment >>
A second embodiment of the image display device front plate 10 and the image display device 20 according to the present invention will be described with reference to FIG.
The image display device front plate 10 and the image display device 20 shown in FIG. 2 are in close contact with the microlouver type filter 5 and the image display plate 4 in the configuration of the first embodiment illustrated in FIG. The transparent adhesive layer 3 is different from the transparent adhesive layer 3 in contact with the front plate 10 for the image display device, and further includes the microlouver filter 5 on the image display plate 4 side. The same as in the first embodiment. Therefore, here, the microlouver filter 5 will be mainly described.

Note that the adhesion lamination of the microlouver filter 5 (by the transparent adhesive layer 3 located on the image display board 4 side) is the same as the adhesion lamination of the front panel 10 for the image display device in the first embodiment. Can be. For example, first, the image display device front plate 10 and the microlouver filter 5 are adhered and laminated by the transparent adhesive layer 3 on the viewer side of the microlouver filter 5, so that the image display device front plate 10 and the microlouver type are formed. A laminated plate is produced in which the filter 5 is closely laminated with the transparent adhesive layer 3 interposed therebetween. Then, this laminated plate is laminated on the image display plate 4 through the transparent adhesive layer 3 on the side of the image display plate 4 of the microlouver filter 5 to obtain the image display device 20.
The microlouver type filter 5 is first adhered and laminated on the image display board 4 with the transparent adhesive layer 3, and the image display device is formed on the surface of the laminated microlouver type filter 5 with the transparent adhesive layer 3 on the observer side. The front plate 10 may be closely stacked.

  In the second embodiment, the traveling direction of the image light from the image display board and the ambient light in the surrounding environment can be controlled by the microlouver filter 5. As a result, it is possible to improve the bright room contrast by reducing the influence of outside light, and to appropriately collect or diffuse the image light from the image display board to improve the front luminance or optimize the viewing angle. Can do.

[Microlouver filter]
The microlouver filter 5 includes a linear dark line portion 5a in which a plurality of extending directions are arranged in parallel to each other, and a transparent resin layer 5b present at least between the dark line portions 5a. As the microlouver filter 5, a known filter disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-272161 can be appropriately employed.
In the micro louver type filter 5 of the present embodiment, the main cut surface of the dark linear portion 5a has a triangular shape and is arranged in such a direction that the base side is the viewer side, and the refractive index of the transparent resin layer 5b is the dark line. By making the refractive index higher than the refractive index of the resin component of the shape portion 5a, a part of the image light hits the slope of the triangle at an angle greater than the critical angle and is totally diffused and emitted. Has the effect of widening the viewing angle. Further, most of the outside light such as electric light is incident on the slope of the triangle at an angle less than the critical angle so that it is absorbed by the dark color material in the dark color linear portion 5a, and the image in the presence of the outside light is absorbed. It has the effect of improving contrast between light and dark.

The dark linear portion 5a can be formed of a dark color material, and the transparent resin layer 5b can be formed of a transparent material. In this embodiment, these materials are formed by curing with ultraviolet rays using an ultraviolet curable acrylic resin. it can. The dark color material is a material obtained by adding a dark color material composed of carbon black to an ultraviolet curable acrylic resin.
Note that the size of the dark linear portions 5a and the arrangement period thereof are appropriately set depending on the application, and in the case of an isosceles triangle shape, for example, the size of the base is 17 μm, the height is 120 μm, and the arrangement period is 85 μm.

  The action of the microlouver type filter 5 is to absorb the external light coming from the direction in which the dark line strip portion 5a is inclined with respect to the normal line of the filter surface with respect to the external light, and the transparency between the dark color strip portions 5a. The portion of the resin layer 5b becomes a light transmission portion that transmits image light. This can suppress the influence of external light and improve the bright room contrast. For the image light, the main cut surface shape of the dark linear portion 5a including the direction thereof is set as described above, thereby diffusing the image light and increasing the viewing angle, It is possible to increase the front luminance by focusing in the direction.

(Dark color strip)
The dark color strip portion 5a is formed of a dark color material. As the dark color material, a resin composition such as a paint (or ink) in which a light-absorbing color material is contained in a resin binder can be used. As the light-absorbing color material, a dark color material having a high light-absorbing property and exhibiting a dark color, that is, a chromatic or achromatic color with low brightness can be used. A representative example of the dark color is black, and an achromatic black color is preferable because it does not affect the color of the image display and the external light absorption is large. In addition, examples of low-lightness chromatic colors include brown, amber, rosy, and dark green. As the dark color material, a known color material, for example, black pigment such as carbon black or black iron oxide, black dye such as aniline black, or the like may be used. The dark color material may be dark resin particles obtained by coloring acrylic resin particles or the like with these dark color materials in a dark color. Further, a dark color material may be an achromatic color such as black or a chromatic dark color by mixing a plurality of kinds of chromatic color materials such as blue, yellow, and red, and mixing the colors.

  The particles may be either in a dispersed form in which each particle is non-aggregated and independent, or in a dispersed form in which a plurality of particles are aggregated into composite particles. The particle size of the particles (in the case of composite particles, the particle size in the composite state) is usually about 0.1 to 10 μm in average particle size. A plurality of particles having different particle diameters may be mixed. The addition amount of the dark color material is usually 5 to 1000 parts by mass with respect to 100 parts by mass of the binder resin of the resin binder.

  There is no restriction | limiting in particular as said resin binder, For example, a thermoplastic resin and a curable resin can be used. Examples of thermoplastic resins include acrylic resins, polyester resins, styrene resins, and vinyl chloride-vinyl acetate copolymers. Curing resins include thermosetting resins, cured with electron beams and ultraviolet rays. Ionizing radiation curable resins, thermosetting resins include two-part curable urethane resins, epoxy resins, etc., and ionizing radiation curable resins include (meth) acrylates, polyesters, epoxy Examples of such resins are listed below. Among these, ionizing radiation curable resins are suitable resins because they can be solidified rapidly and can be made solvent-free. As the ionizing radiation, ultraviolet rays or electron beams are usually used.

If the side surface of the dark linear portion 5a, for example, the main cut surface shape is a triangle, as in the case where the micro louver filter 5 has an action of diffusing image light to widen the viewing angle, the surface of the hypotenuse of the triangle is used. Therefore, it is necessary to efficiently totally reflect light such as image light. For this purpose, the relationship between the refractive index na of the dark-colored linear portion 5a and the refractive index nb of the transparent resin layer 5b is preferably set to na ≦ nb. In other words, the refractive index of the material on the dark color linear portion 5a side of the interface is made lower than or equal to the refractive index of the material on the transparent resin layer 5b side of the interface at the interface on the side surface of the dark color linear portion 5a. (Na <nb) is preferred.
Such a difference in refractive index can be imparted by appropriately selecting the binder resin of the dark color linear portion 5a and the resin of the transparent resin layer 5b.

  The formation of the dark color stripe portion 5a is performed by first forming the transparent resin layer 5b having the concave and convex portions reverse to the dark color stripe portion 5a on the surface and then filling the dark color material into the concave stripe portion. Can be formed. Filling, for example, by applying a dark color material to the surface of the transparent resin layer 5b on which the concave stripe portion is formed, and then removing unnecessary dark color material other than the concave stripe portion by a so-called wiping method, Leave dark material only in the recess. Thereafter, the dark material is allowed to solidify.

(Transparent resin layer)
The transparent resin 5b has a thickness in the thickness direction that is at least equal to or greater than the thickness of the dark color stripes 5a, and in the surface direction, the dark color stripes 5a are filled to reinforce the dark color stripes 5a and transmit image light. It is a transparent resin layer which forms a light transmission part. The thickness of the transparent resin layer 5b is equal to or greater than the height (thickness) of the dark colored stripe portion 5a, and is, for example, about 100 to 300 μm.

  As the resin constituting the transparent resin layer 5b, an ultraviolet curable acrylic resin is selected in the present embodiment. However, in general, the resin is not particularly limited as long as it is transparent. For example, a thermoplastic resin, A curable resin can be used. Examples of thermoplastic resins include acrylic resins, polyester resins, styrene resins, olefin resins, and polyvinyl chloride. Curing resins include thermosetting resins, ionization that cures with electron beams, ultraviolet rays, and the like. There are radiation curable resins. Examples of thermosetting resins include two-component curable urethane resins and epoxy resins. Examples of ionizing radiation curable resins include (meth) acrylates, polyesters, and epoxy resins. These resins are mentioned. Here, “(meth) acrylate” means “acrylate or methacrylate”. Among these, ionizing radiation curable resins are suitable resins because they can be solidified rapidly and can be made solvent-free.

In addition, in order to form the transparent resin layer 5b in which the concave and convex portions reverse to the dark line portions 5a are formed, a known molding method, for example, a heated mold is used as a thermoplastic resin layer. Pressing hot pressing method, casting method in which a thermoplastic resin composition is injected into a mold and solidifying, injection molding method, ionizing radiation curable resin composition is injected into the mold (inside) and cured with ionizing radiation The photopolymer method (aka 2P method) to be used can be used. Among these molding methods, the photopolymer method is more preferable in terms of excellent productivity. In the photopolymer method, a cylindrical mold can be used for continuous molding while supplying a continuous sheet. Using the continuous sheet as a filter base material, a transparent resin layer 5b and a dark-colored linear portion 5a are formed on the filter base material to obtain a microlouver filter 5 including these.
In addition, the said filter base material can use the flexible thing among the materials listed by the said transparent base material 1, ie, a resin sheet (or film). In this case, the resin sheet portion becomes a base layer included in the transparent resin layer 5b.

<Deformation>
The front plate 10 for an image display device and the image display device 20 of the present invention can take various forms other than the above-described configuration. Some of them will be described below. However, it is not limited to the form described here.

[Coloring part]
In each of the above embodiments, the colored portion 2 is a single layer and has a form in which the thickness is continuously increased from the inner side to the outer side of the transparent substrate, as shown in FIG. As shown in b), a single layer having a constant thickness may be stacked stepwise so that the thickness increases stepwise from the inside toward the outside. The colored layer 2 in FIG. 3B has a form in which three layers of the colored layer 2a, the colored layer 2b, and the colored layer 2c are laminated and stacked on the back side surface of the transparent substrate 1 in order of multicolor printing. In this case, it is the colored layer 2a that forms the inner end portion of the plurality of layers constituting the colored layer 2, and there is a step at the inner end portion depending on the thickness of the colored layer 2a. Of course, it should be formed in such a thickness that does not occur. Such a thickness that does not generate bubbles is less than 1 μm, more preferably less than 0.5 μm.

Further, as shown in FIG. 4, the coloring portion 2 may include a pattern 6 in a plan view. The pattern 6 is a shape element in the surface direction.
In FIG. 4, the letter “A” is pattern 6. FIG. 4 shows an example in which the position of the pattern 6 is provided at a position apart from the inner and outer end portions of the coloring portion 2 and between both end portions, but it may be on the end portion. .
The planar view shape of the pattern 6 is arbitrary, such as a character, a number, a symbol, a geometric figure, a halftone dot pattern, an arabesque pattern, a gradation pattern, and other patterns. In the case of characters, for example, a product logo mark, a manufacturer name, etc. can be expressed. In addition, the design can be improved with geometric figures and patterns. Further, the pattern 6 may be an identification mark on the assembly process for identifying the left and right positions of the image display device front plate 10. In these cases, the pattern 6 has a visible shape. However, other than this, the pattern 6 may not be visible with visible light, and may be visible by emitting visible light fluorescence when irradiated with ultraviolet rays.
Further, the pattern 6 may be invisible if it is sufficient to be mechanically recognized, such as a position detection identification mark, in addition to the visible pattern including fluorescence emission.
Similarly, the pattern 6 may be invisible or difficult to visually discern, but may be used as a window of a detection unit of an infrared remote controller as infrared transmission. Specific examples of forming such a pattern 6 include the following modes. That is, an acrylic resin plate that transmits both visible light and near infrared light is used as the transparent substrate 1. Then, the pattern 6 portion of the frame-like colored portion 2 is printed with a black ink of a three-color mixture in which three kinds of pigments of isoindolinone yellow, quinacridone red, and phthalocyanine blue are added in an acrylic resin binder. To do. This ink looks black to black brown with the naked eye, but has transparency in the near infrared region with a wavelength of 800 to 1100 nm. On the other hand, portions other than the pattern 6 in the frame-like colored portion 2 are printed with black ink in which carbon black is added to an acrylic resin binder. This ink appears black to the naked eye and becomes opaque to near infrared rays.

  The pattern 6 may be formed by reducing the thickness of the colored layer 2 by multicolor printing, or by not forming only that part as shown in FIG. It is preferable to use a color, or to have a lower hiding property than the surroundings (the same color is thin and the thickness is the same and the color is changed, etc.). In the case of low concealment, the back light provided on the back side surface may be turned on to emphasize the pattern so that it can be seen well, or may not be visible when the light is turned off.

[Main cut surface shape of dark colored strip]
The main cut surface shape of the dark colored strip 5a is not particularly limited. For example, in the embodiment of FIG. 2, the triangle (isosceles triangle) is used, but in addition to this, a polygon having a base parallel to the surface direction, such as an unequal triangle, a square, a rectangle, a trapezoid, and a pentagon, For example, a shape in which a polygonal side is curved, such as a shape in which a hypotenuse on one side or both sides of a trapezoid is curved and bulged or recessed in a surface direction.

  In addition, the base of the main cut surface shape of the dark colored strip 5a was a straight line parallel to the surface direction as shown in FIG. 6B as the base of the isosceles triangle in the embodiment of FIG. In addition, a shape in which the bottom is recessed in a concave shape as shown in FIG. 6A, or a shape in which the bottom is in a convex shape as shown in FIG. 6C may be used. Note that the bases illustrated in FIGS. 6A and 6C each have a shape that forms a curved portion having no pointed portion between the two ends of the base, that is, a cusp. That is, this is a case where the shape of the base at a portion not including at least both ends of the base is a curve having no cusp.

  In the case where the bottom of the dark line 5a is recessed as shown in FIG. 6A, the depth from the level surface of the surface of the transparent resin 5b to the lowest part of the recess is 1.5 to 7 μm. It is preferable in order to achieve the inherent effect, and there is an advantage that the adhesiveness due to the anchoring effect with the transparent adhesive layer 3 is improved. On the other hand, there is a disadvantage that air bubbles easily remain in the recess.

  On the other hand, in the case where the bottom is swollen in a convex shape as shown in FIG. 6C, the height from the level surface of the surface of the transparent resin 5b to the highest portion of the convex portion is 1.5 to 7 μm. It is preferable for producing its inherent effect, and has an advantage that air between the transparent adhesive layer 3 is easily removed and bubbles are not easily left. Moreover, the effect of improving the adhesiveness with the transparent adhesive layer 3 by the anchoring effect can be expected to some extent although it is not as much as the embodiment of FIG.

As a method of making the bottom of the dark colored strip 5a bulge in a convex shape as shown in FIG. 6C, for example, the following methods (1) and (2) can be mentioned.
(1) A part or all of the resin binder of the dark color material to be filled in the concave portion on the transparent resin layer 5b is composed of a curable resin that undergoes volume expansion during curing, and the uncured material of the dark color material is formed into the concave portion. After filling, the curable resin is cured to expand the dark material in volume. Examples of the resin that undergoes volume expansion upon curing include (I) an oxetane ring-containing vinyl ether compound (A) and / or an alicyclic epoxy group-containing vinyl ether compound (B) described in JP-A-2009-138116, A cationically polymerizable resin composition containing an oligomer or polymer (C) having at least one oxetane group, epoxy group, hydroxyl group, vinyl ether group, or aliphatic or alicyclic unsaturated hydrocarbon group and having a molecular weight of 500 or more, A resin composition containing a swellable monomer such as spiro orthocarbonate or dithiocarbonate, (II) a cyanate resin described in Japanese Patent No. 3772913, and a compound containing at least one phenolic hydroxyl group. Imide carbonate that is an intermediate of the cured cyanate resin A resin composition comprising an epoxy resin and a thermoplastic resin, and (III) a composition comprising an unsaturated polyester resin oligomer, cobalt naphthenate and methyl ethyl ketone peroxide described in JP-B-59-4444 Examples thereof include a resin composition obtained by adding 1.73 times or more by weight of styrene monomer to polyester.
(2) A thermal decomposition type foaming agent is added to the resin composition constituting the dark color material to be filled in the concave portion on the transparent resin layer 5b, and after filling the dark color material into the concave portion, Heating above the pyrolysis temperature causes the dark material to expand in volume. Examples of the pyrolytic foaming agent include azodicarbonamide, oxybisbenzenesulfonyl hydrazide, and the like.

Further, the orientation of the main cut surface shape of the dark colored strip 5a with respect to the observer V (or the image display board) is the orientation in which the base of the isosceles triangle is the observer side in the embodiment of FIG. There may be a direction in which the bottom side is the image display board side.
Here, the “bottom edge” of the main cut surface shape of the dark colored strip 5a is the portion where the “width” of the main cut shape, which is the size in the surface direction, is the largest in the vertical position.

  The configuration in which the base is directed toward the image display board can widen the viewing angle of the image light from the image display board, and conversely, the configuration in which the base is directed to the observer side regulates the viewing angle of the image light. be able to. Further, regardless of the direction of the base, it is possible to improve the bright room contrast by suppressing the influence of the external light, particularly the external light coming from the arrangement direction of the dark colored stripes 5a.

  In addition, the extending direction of the linear dark linear portion 5a in which a plurality of extending directions are arranged in parallel to each other is an example of one direction in the above embodiment, but a plurality of directions, for example, two directions are intersected. Also good. The intersection is, for example, a right angle.

[Other filters]
The filter included in the image display device 20 may include other various filters in addition to the microlouver filter 5 illustrated in FIG. The image display device 20 shown in FIG. 7 is an example including a filter 7 that is not limited to the micro louver filter 5 (there may be the micro louver filter 5). In the drawing, the position of the filter 7 is at least the image display device front plate 10, the transparent adhesive layer 3, the filter 7, the transparent adhesive layer 3, and the image display plate 4 in order from the observer side of the image display device 20. It is the example of a layer structure containing.

  As the filter 7, various conventionally known filters can be employed as the filter of the image display device 20. For example, the filter 7 includes an optical filter and an electromagnetic wave shielding filter.

  In addition to the micro louver type filter 5, the optical filter includes an anti-reflection filter (anti-glare, anti-reflection, anti-glare and anti-reflection), a near-infrared absorption filter (absorbs near-infrared light emitted from the PDP, Such as a neon light absorption filter (absorbing neon light emitted from the PDP), a color correction filter (correcting the color of the display image to a desired color), an ultraviolet absorption filter, and the like. These various optical filters may also have a filter function.

As the electromagnetic wave shielding filter, a publicly known filter can be used when the image display plate 4 emits unnecessary electromagnetic waves particularly in a PDP or the like. For example, the electromagnetic wave shielding filter includes a transparent conductive thin film such as a metal mesh such as an etching mesh of copper foil, a printing mesh using a conductive paste, or a multilayer sputtered film formed not on the mesh but on the entire surface. The metal of the metal mesh may be aluminum other than copper. Moreover, the electromagnetic wave shielding filter usually includes a transparent substrate layer that supports these metal mesh, printed mesh, transparent conductive thin film, and the like. As a transparent base material layer, the resin sheet etc. which were mentioned by the transparent base material 1, etc. are used.
In addition, in the printing mesh, the mesh by the "drawing primer type | mold intaglio printing method" disclosed by the pamphlet of international publication 2008/149969 is preferable at the point which can be made high-definition. In this intaglio printing method, a primer layer made of ionizing radiation curable resin or the like that pulls out the ink (conductive paste) filled in the recesses of the intaglio plate surface and promotes the transfer to the substrate is printed during printing. In this method, the material is allowed to act in a fluid state and solidified on the plate surface, and then released and printed.

  The position of the filter 7 is not limited to the position illustrated in FIG. 7. For example, in the antireflection filter, the front plate 10 for an image display device can be provided at the position of the outermost surface on the viewer side. However, in the case of the micro louver type filter 5 described above, it is preferable in terms of suppression of ghost images to be provided at a position closer to the image display plate 4 than the front plate 10 for the image display device.

[Other functional layers]
The front plate 10 for an image display device according to the present invention can include various functional layers, for example, a hard coat layer, an antistatic layer, a contamination preventive layer, an antibacterial layer, and the like. Moreover, each of these illustrated layers can be provided on the observer side of the transparent substrate 1, for example.

<Application>
The use of the front plate for an image display device of the present invention can be suitably used for a use in which the front plate is placed on the front of various image display plates.
The image display board is not particularly limited, and may be a flat panel display (FPD) such as a plasma display panel (PDP), a liquid crystal display (LCD), an electroluminescence (EL) display, or a conventional cathode ray tube (CRT) display. good. Further, as the above-mentioned image display board, a three-dimensional image (three-dimensional image) as disclosed in JP 2009-145698 A, JP 2009-15016 A, etc., in addition to a method of displaying a normal planar image. May be used. An image display device in which a front plate for an image display device is arranged in front of these image display plates is a television receiver, a digital photo frame, an electronic signboard, a telephone, an amusement device, a measuring device, an instrument, an office device. Used as a display unit for medical equipment, computer equipment, etc.

DESCRIPTION OF SYMBOLS 1 Transparent base material 2 Colored layer 2a, 2b, 2c Colored layer 3 Transparent adhesive layer (including adhesive layer)
4 Image display board 5 Microlouver filter 5a Dark line 5b Transparent resin layer 6 Pattern 7 Filter 10 Image display device front plate 20 Image display device 21 Conventional coloring unit 101 Conventional image display device front plate 201 Conventional image Display device G Bubble V Observer

Claims (3)

A front plate for an image display device having a colored layer at a peripheral edge on a substrate surface of a transparent substrate,
The front plate for an image display device, wherein the thickness of the colored layer increases from the inside to the outside of the front plate.   The image display device front plate according to claim 1, the transparent adhesive layer closely adhered to the surface of the image display device front plate on which the colored layer is formed, and the image display plate are included at least in this order. , Image display device. Between the transparent adhesive layer and the image display board, a micro louver filter comprising a linear dark color linear portion having a plurality of extending directions arranged in parallel with each other and a transparent resin layer between the dark color linear portions is included. The image display device according to claim 2.

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